3.3 Position of the damper blade
The position of the damper blade corresponds to the
mark on the axis and is thus recognisable from the out-
side.
Fig. 3: Actuators with positive locking
1
Shaft with marking for position indication
2
Damper blade
Fig. 4: Actuator with traction
1
Shaft with marking for position indication
2
Damper blade
Fig. 5: Actuator on TVE
1
Shaft with marking for position indication
2
Damper blade
3.4 Function description
Basic function
The Easy controller is an electronic control component
for variable volume flow control for various TROX VAV
terminal units. Its functional units consist of a dynamic
differential pressure transducer, the controller elec-
tronics and the actuator.
Closed control circuit
The controller operates in closed loop, i.e. to measure –
compare – control.
The determination of the current volume flow rate takes
place by measuring a differential pressure (effective
pressure). For this purpose, the volume flow controller
has a differential pressure sensor. The effective pres-
sure is forwarded through the measuring hoses or, in
the case of TVE, through the damper blade shaft to the
differential pressure transducer integrated in the control
component and converted here into a voltage signal.
The volume flow rate actual value is thus the internal
control loop as well as an external use, e. g. BMS or
master-slave sequential circuit, available as analogue
voltage signal 0
‑
10 V. Due to the factory adjustment, the
maximum output value of 10 V DC always corresponds
to the nominal volume flow rate (V nominal) which can
be taken from the scale sticker and the adjustments
sticker on the VAV terminal unit.
The nominal volume flow rate is either set as a constant
value or specified by an analogue voltage signal at the
setpoint value input. The definition of the constant
volume flow rates or of the working range for variable
operation is carried out by the customer at the setting
potentiometers V
min
and V
max
.
In regular operation, the integrated actuator is controlled
by permanent evaluation of the offset (setpoint value-
actual) that adjusts the damper blade of the air terminal
unit via the axle mounting and thus regulates the
volume flow rate to the setpoint value.
Structure and functional description
Function description
Control component Easy for VAV terminal units
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